56 DRIIXIA. 



The first one is the Pencilled Drillia, Drillia peni- 

 cillata, Cpr., Dril'-li-a pen-i-sil-la'-ta. A picture of 

 this graceful shell is shown in Fig. 38. 

 The spire consists of eight slender whorls ; 

 the aperture is long, and the surface is 

 smooth, brownish, and marked by very 

 delicate cross-lines of color. Length, an 

 inch and a half ; southern. 



Di r illia torosa, Cpr., to-ro'-sa 

 Fig. 39, is found farther to the 

 north. It is rather less grace- 

 ful than its southern relative, 

 and is somewhat smaller, also. 

 Fig. 38. The surface is almost black, but 

 each whorl is marked by a spiral row of 

 lighter-colored knobs. Fig~39- 



The third species, Drillia mcesta, Cpr., me'-sta, 

 resembles the last, but the whorls have cross-ribs 

 instead of knobs. The body- whorl, however, is 

 nearly smooth. Color, brown or olive ; length, one 

 inch ; southern. Said to be found under stones, 

 between tides. 



Myurella si??iplex, Cpr., My-u-rel'-la sim'-plex^ 

 Fig. 40, is another southern mollusk, having a very 

 pretty, slender, conical shell. The spire winds grace- 

 fully upward, and ends in a sharp point at 

 the apex ; while at the other end of the shell 

 the aperture is small, and ends in a short, 

 recurved canal. Following the sutures is a 

 spiral thread of beads, which adds much to 

 the attractiveness of the shell. The length 

 is an inch or more, the whorls are about 

 twelve in number, and the color is whitish or 

 Fig. 40. brown. 



